How to Verify Square Webhook Signatures (and the Notification-URL Trap)
Square's webhook signature catches people in a specific way: the signature is computed over the notification URL joined to the raw request body, not t…
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The Everyday Backend Engineer: Step 10 — The Observer Pattern
Welcome back to The Everyday Backend Engineer: Practical Design Patterns . In our last post, we made our core algorithms interchangeable using the Str…
Node.js Hackathon Backends: From Idea to Demo in Under an Hour
Hackathons are intense. You've got a brilliant idea, a tight deadline, and often, limited sleep. The last thing you want is to spend half your preciou…
Large PDFs in Node.js Without Unbounded Buffering
Originally published at htpbe.tech . The version on htpbe.tech stays in sync with the latest detection algorithm — refer to it for the canonical text.…
The blueprint: an HTML-to-PDF API on Postgres, Chromium, and not much else
PDF generation in 2026 is glued together from Puppeteer, LiquidJS, and S3. What's not solved by the glue is the production shape around it: Documents …
Bun v1.3.14: The Update That Brings Speed and Power to the Table
As a developer who's been keeping an eye on the rising star that is Bun, I was excited to see the latest release, v1.3.14. This update brings a slew o…
Day 145 of Learning MERN Stack
Hello Dev Community! 👋 It is officially Day 145 of my software engineering marathon! Today, I locked down the definitive user document model layer for…
Failure Engineering Explained by Uncle to Nephew — Episode 4: Failure Handling
Episode 3 covered detection — how a system finds out something broke. Episode 4 is the next link: detection told you something's wrong, now what? Satu…
Brute forcing my way to better HTML > DOCX conversion
About 10 years ago I fell in love with Vue.js. The easy-to-learn syntax and reactivity were a joy to work with, and HMR (hot module replacement) added…
Node.js Syllabus for Beginners 🚀 | Complete Backend Roadmap
Node.js Syllabus for Beginners 🚀 If you're planning to become a Backend Developer, Full Stack Developer, or JavaScript Developer, learning Node.js is …
7 things I learned trying to stop LLM API bills from silently exploding
My first real LLM bill surprise wasn't dramatic. No infinite loop, no viral spike. A retry policy I'd written months earlier met a flaky endpoint, and…
Failure Engineering Explained by Uncle to Nephew — Episode 3: Failure Detection
Episode 2 gave you the seven categories of failure. Episode 3 answers the first real lifecycle question: once one of those seven happens, how does you…
A stranger fixed my bug. Then I found out he fixed the wrong half — and it still worked.
Someone opened a pull request against my Safari MCP server last week. Three functions, same treatment each, clean write-up, all CI green. It fixed a r…
Stop logging PII: a configurable Node.js sanitizer logger
Originally published on my blog: https://blog.bajonczak.com/stop-logging-pii-a-configurable-node-js-sanitizer-logger/ Logging is one of those topics t…
Shipping Async Video Background Removal at $0.10/sec
Why async matters for video I've been running useKnockout - a background removal API that processes images in ~200ms - for a few months. Images are fa…
Building a Modern Chess Platform with Vue.js, Node.js and React Native
🚀 Building a Modern Chess Platform with Vue.js, Node.js and React Native How a passion for chess turned into building a modern chess platform from the…
cordless v0.6: Going CLI-First — Run It, Scan the QR, You're Paired
TL;DR — cordless manages your remote terminal / coding-agent (Claude Code, Codex) sessions and puts them on your phone. v0.6 makes it CLI-first : run …
React Approval Emails Without Effect Loops
Approval flows look simple in product meetings, then get weird fast in code. A reviewer clicks Approve, the UI updates, a follow-up email should go ou…
A Beginner's Guide to Installing and Using Node.js on Windows
Have you ever wondered how massive modern platforms like Netflix, PayPal, and LinkedIn handle millions of users simultaneously without crashing? The s…
fluent-ffmpeg vs FFmpeg Micro: Why Node.js Developers Switch to a Cloud API
Originally published at ffmpeg-micro.com fluent-ffmpeg is the go-to FFmpeg wrapper for Node.js developers. It works perfectly on your laptop. Then you…
Convert a whole folder of images to WebP — locally, no upload, one command
Every few months I hit the same wall: a folder full of .jpg and .png files that need to be WebP before they go anywhere near production. And every few…
Failure Engineering Explained by Uncle to Nephew — Episode 1: Why Failures Are Normal
New series, same two people from the Node.js Internals series. Where that series answered "how does the system work?", this one answers "how does the …
Why I Built a Lightweight Alternative to dotenv
The Problem dotenv is the standard for loading .env files in Node.js — but it has more features than most projects need, and the dependency tree keeps…
Kill the Server: Why Holepunch Threw Away Node.js and Built 'Bare'
When the Holepunch team set out to build Pear—a decentralized, peer-to-peer application runtime—they started with the obvious choice: Node.js. Node is…
Building a Fully Automated Facebook Post Scheduler using Node.js and GitHub Actions
How I Built a Zero-Cost Facebook Auto-Poster Using Node.js and GitHub Actions Automating social media management can save hours of manual work. In thi…
Type-Safe Email Events for React Teams
Transactional emails rarely break in one loud place. They drift a little in the React form, a little in the API shape, and a little again in the backg…
Node.js 26 Enables Temporal by Default — Time to Ditch Date?
The morning after a deploy, the billing report arrived with an entire day blanked out. The code was one unremarkable line that pulled "from yesterday'…
How to Test Twilio Webhooks Locally
The Problem: Twilio Webhooks Won't Hit Your Localhost When you're building a Twilio integration—whether handling incoming SMS, voice callbacks, or cal…
Node.js Internals Explained by Uncle to Nephew — Part 4: Express Plumbing, Error Handling & The Full Roadmap
Bonus round. Parts 1–3 covered why Node exists, what's happening inside it, and the full request journey. This part mops up the pieces that didn't fit…
Track Every LLM Token in Node.js with all-llm-token-tracker
Tags (pick up to 4) node javascript openai llm (Alternates: typescript , npm , webdev ) Cover image (optional) Use a dashboard screenshot or a simple …